DEPARTMENT OF ENTOMOLOGY. 



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where each changes to a chrysalis, to emerge soon afterward 

 as a fully developed butterfly. There are two broods each 

 season. 



Fi«-. 12.— Elm twig showing work of Autiopa Caterpillars 



These colonies of caterpillars are usually so conspicuous 

 that it is an easy matter to cut off the branch on which they 

 are feeding, and to crush them. Some of the caterpillars, the 

 defoliated twig, and the slight silken web they make while 

 they are at w^ork are represented in Fig. 12. 



Another insect attacking fruit and shade trees, which was 

 extraordinarily abundant this year, was the fall web worm 

 (Hyphantria cunea). The unsightly webs of these caterpil- 

 lars, during the late summer and early autumn, festooned a 

 large proportion of the orchard trees in southern New Hamp- 

 shire. To many young trees these caterpillars must have 



